"Avatar" actress Zoë Saldana is engaged, reports the new issue of Us Weekly (on newsstands now).

The actress, 32, "is thrilled" to tie the knot with boyfriend of 10 years, Keith Britton, a source tells Us. "They’ve been together forever. They’re a great couple."

But a low-key one!

Saldana has mostly kept quiet about her relationship with the 33-year-old actor and CEO of My Fashion Database.

"She doesn’t even introduce him as her fiancé," adds another insider. "She will just say, 'This is Keith.' She likes to keep her personal life to herself and wants people to focus on her as an actress."

The second source tells Us that Saldana isn't stressing about the wedding, either: "She hasn’t stopped working to plan anything."